Yes, there's also the Global Server List Workaround which you can use to connect to Vanilla servers.
As for mods, I'd recommend these:
- Discovery 4.85 Reunion / Vanilla based mod, you won't be disappointed.
- Tekagi's Treasure 5.48 / Soon to be 5.49
- Crossfire 1.8 / a bit huge
- Underverse / Different, but very interesting
As for "clans" you can join, it depends if you want to be a good or a bad guy. If you want to be a good guy, then I suggest you check out my clan, LSF.